Gas-burner installation



Filed July 1o. 1925 35l Y Y 2, vrthe numerals 1 1 indicatehot blast stoves*- and the numeral 2 indicates y a staclr.- The numeral 3 indicatesran air.ma1n,wh ich sup- Patented May 14, 19729.

l UNITED sTATEsPATENT AoF1=1c|5'.-g

FREDERICK H. WILLCOX, F CHICAGO, ILLINOIASSIGNOR T0 FREYN' EITC-INEEIRClN-'G-4 i COMIANY,` OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

GAS-BURNER rns'rALLn'rIoN.

Application filed lJuly 10, 1925. -Serial No. 42,624.

The presentinvention 1 relates to gas burner installations aty hot blast stoves, used atblastfurnaces. Y Y Y More particularly, the present invention 5 relates to the arrangement of the valves in connection with a` hot blast stove installation, yand hasfor lone/ of its objects the provision ofan arrangement for preventing the formation of explosive mixtures with gas.

A further object is to provide a blastfurnace installation which in the event of leali-r age of the valves ordinarily provided will prevent the admixture ofthe blastA furnace gas with the air supply, whereby the danger of explosion is minimized. M

A further obj ect is to provide a relief. valve arrangement which may be used with blast furnace constructions as now known and used, whichvrelief valve will minimize the danger of explosions. 1

Further objects will appearas the description proceeds. f vReferring tothe drawings p V-Figure 1 is a diagrammatic view, partly in elevation and partly in section, of a gas I burner installation at hot blast stoves of blast furnaces embodying the principles f of the present invention;f.

' Figure'2 isa diagrammatic ,view illus-` trating a batteryof hot blast stoves with their cooperating gas and air mains; andV Figure 3 is a det-ail' view on an enlarged scale showing a relief valve used iny practice of the present invention.

` Referring first to the disclosure of Figure plies air under pressure'to the burners 4 4 40 lof the hot blast-stoves 1 1. The numeral 5 indicates a gasmain which supplies combustible gas throughthe vpipes 6 6 to said .burners 4 4. Admission of air and gas to thel hot blast stoves 4 4. .is controlled f by meansl of .the valves' 7 7. The. hot blast main is indicated bythe. numeral 8, which main is connected t'o the stoves 1 1 through the pipes 9 9. i Referring more particularlyto the stru@ ture shown in Figure 1, it will be noted that the gas flow or supply to the burner is con-` trolled by the valve 10 and by the butterfly dam er 11. The air main 3 directs air to the urner 4 through the pipe 12, which is controlled by the Yvalve 13 and the butterfly the f damper 14. Disposed in the air. pipe 12'is' l the reliefvalve 15. Said relief valve 15 is pivot-ally mounted for movement about the axis r16, the counterweight17 beingprovided for tending to swing saidreliefvalve 15 to a position to close communication between the air main 3 and the burner 4, and to open `communication between the valve -7 and the atmosphere.y y y In orderto provide a mounting for ythe relief valve 15, a casting 18 may be provided, having1 the valve seat 19V adapted VVifor co-4 operation with the relief yvalve 15.H The casting 18 is also provided with the .valve seat 20, providing an opening to the atmosphere, which valve seat 20 is adapted also to cooperate with the yrelief valve 15.vr As .the parts are viewed in Figures 1 and 3, the counter-weight 17tends to swing the relief valve 15 in a counterclookwise direction, whereby to seat said relief valve4 upon `the valve seat 19v to close communication from the `air main 3 and toallow communication? with the atmosphere Vfrom the valve* 7. .Y Movement of saidV valve 15 is responsive to 80 pressure within the air pipe 12 and air mainv 3. If pressure should fail'within lthe air main 3,. the counterweight 17 will cause movementof the relief, valve' 15 toits positionv on the valve Seat 19. When a normal Ases l pressure is maintained within the air pipe 12,1 however, the reliefvalve 15 will'be held against the valve seat20,"whereby the pas# sage of air is permitted i :rom the air main 3 and air pipe 12 to the burner/1.-

In explaining the operation of the above described embodiment of the presenti invention,l two conditions may. be assumed, as follows :l (.1) l In case the stoves 1 1 are on gas and combustion air, the -valve 1-3will be g5 open, the relief valve 15 will beclosed to the atmosphere, (that is, in itsposition on the -seat'20, as shownin Figures `1 and 3), ythe valve l0 will be open, and the valve 7 will beopen. In case the air pressurek fails, the 100 relief valve 15 will open to the atmosphere, being urged in acounterclockwise direction by the counterweight 17 to a position on the valve seat 19. Under these conditions com-y munication to the air main 3 will be closed, 105 by reason of the fact that the relief valve 15 is seated upon ythe valve 'seat 19. In this,y event, gas from the gas main 5 will not be permitted to Vcommunicate with the air in the air main 3, and .an explosive mixture withinV said air main 3 will be prevented. (2) Incase the stoves are en blast, the valve 13 will be closed, the relief valve l5 will be open to the atmosphere, valve l() will be closed, and valve 'T will he closed. If valves 7 and lO should leali, no explosive mixture will be formed inasmuch as air from the stoves finds its way past the relief valve l5 to the atmosphere instead of passing into the gas pipe G to form an explosive mixture within said gas pipe Gand gas main 5.

`By reason of the construction described, the danger from failure of pressure in the air supply main and the danger from leaky valves is minimized, whereby the danger from explosions is veryV greatly reduced.

The showing innthe present case is diagrammatic in its nature, and many modifications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claims'and is intended to cover applications to gas-,fired steam boilers and to gas-fired heatingor melting furnaces. v I claim: y

gl. In a blast furnace installation, a. hot blast stove, a gas supply conduit, an air supply conduit, said conduits leading to a common region, one of said conduits including a casing havinga pair of valve seats, and valve means within said Acasing adapted to cooperate with said two valve seats, said valve when positioned on Vone of said seats being adapted Eto close communication betweensaid one conduit and said common region Aand to open communication between said common region and the atmosphere and in the other of saidfpositions to close communication of the stove with the atmosphere and to open communication.between saidone conduitand said common region.

l '2.2 In a blast furnaceinstallation of hot blast stoves, a hot blast stove, a gas supply conduit, an arm supply7 conduit, said conduits leading to a common region, one of said conduits including a casing having a pair of valve seats, and valve means within said casing adapted to cooperate with said two valve seats, said valve when positioned on one lof said seats being adapted to close communication between said one conduit and saidl common region and to open communication between said common region and the atmosphere, and lin the other `of said positions toclose communication of the stove with the atmosphere and toopen communication between said one conduit and said common region, said valve being responsive tothe pressure within said one conduit.

3. A blast furnace installation, comprising a hot blast stove, air supply means and gas supply means therefor, and a relief valve in said air supply means, said relief valve being biased to a position to close communication between said air supply means and said stove, said relief vvalve being operable in response to the pressure of fluid within said air supply means for openingr communication between said air supply means and said stove and for controlling communication of the stove to the atmosphere.

4. In a blast furnace installation, a hot blast stove, a conduit for supplying gasfl to said stove, a conduit for supplying air to said stove, which conduits lead to a common region, and a reliefvalvein said air supply conduit, said valve having a pair of alternative positions onefor shutting 0E said air supply conduit and opening communication between'said common region and the atmosphere, and the other for opening said air supply conduit and closing communication of the stove to the atmosphere, said valve being responsive tothe pressure within,

said air supply conduit.A

5. In combination, a hot blast stove, an air supply main, a gas supply main, conduits connecting said mains Vwith said stove, 'a

valve for controlling communication between Y said mains and said stove, and a relief valve in the conduit between said air main-Y and said stove, said relief valve having a pair of predetermined positions, one for shutting off communication of the stove with-the air main conduit and for opening communication between the stove andthe atmosphere, andthe other position closing communication of the stove to the atmosphere yand opening communication between thecorresponding air conduit and said stove;

6. In combination', a hot blast stove, an air main',- a gas supply main, conduits connecting said mainsv with said stove, Aand a relief valve in the conduit between said air `mam and said stove, said relief valvev having a pair of predetermined positions, one for shutting off communication o-f the stove with said air main conduit and for opening communication between said stove' and the atmosphere, and theI other position closing `communication of the stove tothe atmosphere and opening communication between said air conduit and said stove, said relief valve being responsive to the fluid pressure within said air main conduit.

this 7th day Signed at Chicago, Illinois, of July, 1925.

` FREDERICK H. WILLCOX. 

